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misskey/src/prelude/await-all.ts

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type Await<T> = T extends Promise<infer U> ? U : T;
type AwaitAll<T> = {
[P in keyof T]: Await<T[P]>;
};
export async function awaitAll<T>(obj: T): Promise<AwaitAll<T>> {
const target = {} as any;
const keys = Object.keys(obj);
const rawValues = Object.values(obj);
const retValues = ((values: any[]): any[] =>
values.map(value => {
if (!value || !value.constructor || value.constructor.name !== 'Object') return value;
return awaitAll(value);
})
)(rawValues);
const values = await Promise.all(retValues);
for (let i = 0; i < values.length; i++) {
target[keys[i]] = values[i];
}
return target;
}